Very nice! I do like the simplicity of the colour scheme, it is very nice and clean, and the motion of the model is fantastic.
How are you planning on doing the Wyches 'off the ground' or is that going to be via their position on Raiders?
As an aside the Haemonculus in your profile picture is very very nice. I have the same model and need to finish my conversion of it, hopefully I can get it painted as nicely as yours.